linux-kernel - Re: [PATCH v5 5/6] platform/x86: intel_pmc_ipc: Fix iTCO

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Date:   Tue, 4 Apr 2017 16:53:42 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
Cc:     Andy Shevchenko <andy@...radead.org>,
        Zha Qipeng <qipeng.zha@...el.com>,
        "dvhart@...radead.org" <dvhart@...radead.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Wim Van Sebroeck <wim@...ana.be>,
        Sathyanarayanan Kuppuswamy Natarajan <sathyaosid@...il.com>,
        David Box <david.e.box@...ux.intel.com>,
        Rajneesh Bhardwaj <rajneesh.bhardwaj@...el.com>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-watchdog@...r.kernel.org
Subject: Re: [PATCH v5 5/6] platform/x86: intel_pmc_ipc: Fix iTCO_wdt GCS
 memory mapping failure

On Tue, Apr 4, 2017 at 3:24 AM, Kuppuswamy Sathyanarayanan
<sathyanarayanan.kuppuswamy@...ux.intel.com> wrote:
> iTCO_wdt driver need access to PMC_CFG GCR register to modify the
> noreboot setting. Currently, this is done by passing PMC_CFG reg
> address as memory resource to watchdog driver and allowing it directly
> modify the PMC_CFG register. But currently PMC driver also has
> requirement to memory map the entire GCR register space in this driver.
> This causes mem request failure in watchdog driver. So this patch fixes
> this issue by adding api to update noreboot flag and passes them

api -> API

> to watchdog driver via platform data.

This one looks good.

> diff --git a/drivers/platform/x86/intel_pmc_ipc.c b/drivers/platform/x86/intel_pmc_ipc.c
> index 8b7fef0..3d0d6f17 100644
> --- a/drivers/platform/x86/intel_pmc_ipc.c
> +++ b/drivers/platform/x86/intel_pmc_ipc.c
> @@ -112,6 +112,13 @@
>  #define TCO_PMC_OFFSET                 0x8
>  #define TCO_PMC_SIZE                   0x4
>
> +/* PMC register bit definitions */
> +
> +/* PMC_CFG_REG bit masks */
> +#define PMC_CFG_NO_REBOOT_MASK         BIT(4)
> +#define PMC_CFG_NO_REBOOT_ENABLE       BIT(4)
> +#define PMC_CFG_NO_REBOOT_DISABLE      0
> +
>  static struct intel_pmc_ipc_dev {
>         struct device *dev;
>         void __iomem *ipc_base;
> @@ -126,7 +133,6 @@ static struct intel_pmc_ipc_dev {
>         struct platform_device *tco_dev;
>
>         /* gcr */
> -       resource_size_t gcr_base;
>         void __iomem *gcr_mem_base;
>         int gcr_size;
>         bool has_gcr_regs;
> @@ -312,6 +318,18 @@ int intel_pmc_gcr_update(u32 offset, u32 mask, u32 val)
>  }
>  EXPORT_SYMBOL_GPL(intel_pmc_gcr_update);
>
> +static int update_noreboot_bit(bool status)
> +{
> +       if (status)
> +               return intel_pmc_gcr_update(PMC_GCR_PMC_CFG_REG,
> +                                           PMC_CFG_NO_REBOOT_MASK,
> +                                           PMC_CFG_NO_REBOOT_ENABLE);
> +
> +       return intel_pmc_gcr_update(PMC_GCR_PMC_CFG_REG,
> +                                   PMC_CFG_NO_REBOOT_MASK,
> +                                   PMC_CFG_NO_REBOOT_DISABLE);
> +}
> +
>  static int intel_pmc_ipc_check_status(void)
>  {
>         int status;
> @@ -629,15 +647,12 @@ static struct resource tco_res[] = {
>         {
>                 .flags = IORESOURCE_IO,
>         },
> -       /* GCS */
> -       {
> -               .flags = IORESOURCE_MEM,
> -       },
>  };
>
>  static struct itco_wdt_platform_data tco_info = {
>         .name = "Apollo Lake SoC",
>         .version = 5,
> +       .update_noreboot_flag = update_noreboot_bit,
>  };
>
>  #define TELEMETRY_RESOURCE_PUNIT_SSRAM 0
> @@ -694,10 +709,6 @@ static int ipc_create_tco_device(void)
>         res->start = ipcdev.acpi_io_base + SMI_EN_OFFSET;
>         res->end = res->start + SMI_EN_SIZE - 1;
>
> -       res = tco_res + TCO_RESOURCE_GCR_MEM;
> -       res->start = ipcdev.gcr_base + TCO_PMC_OFFSET;
> -       res->end = res->start + TCO_PMC_SIZE - 1;
> -
>         pdev = platform_device_register_full(&pdevinfo);
>         if (IS_ERR(pdev))
>                 return PTR_ERR(pdev);
> @@ -859,7 +870,6 @@ static int ipc_plat_get_res(struct platform_device *pdev)
>         }
>         ipcdev.ipc_base = addr;
>
> -       ipcdev.gcr_base = res->start + PLAT_RESOURCE_GCR_OFFSET;
>         ipcdev.gcr_mem_base = addr + PLAT_RESOURCE_GCR_OFFSET;
>         ipcdev.gcr_size = PLAT_RESOURCE_GCR_SIZE;
>         dev_info(&pdev->dev, "ipc res: %pR\n", res);

-- 
With Best Regards,
Andy Shevchenko